One of Russia's richest businessmen is suing leading Kremlin critic Alexei Navalny for defamation

MOSCOW (Reuters) - One of Russia's richest businessmen has filed
a lawsuit against leading Kremlin critic Alexei Navalny, court
documents released on Thursday showed, after alleging that
Navalny had defamed him.

Navalny has emerged as a major irritant for the Kremlin after
thousands of people across Russia attended anti-graft protests he
organized last month. He says he plans to run against the
Kremlin's candidate in next year's presidential election.

The suit against Navalny was filed in Moscow's Lyublinsky
district court by Alisher Usmanov, part-owner of British soccer
club Arsenal whose business interests include iron ore producer
Metalloinvest, and a major mobile phone operator.